linux-kernel - Re: x86/mce: suspicious RCU usage in 4.13.4

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Message-ID: <20171012221351.GN5109@tassilo.jf.intel.com>
Date:   Thu, 12 Oct 2017 15:13:51 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Luck, Tony" <tony.luck@...el.com>,
        Jeremy Cline <jcline@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Laura Abbott <labbott@...hat.com>
Subject: Re: x86/mce: suspicious RCU usage in 4.13.4

On Thu, Oct 12, 2017 at 11:02:52AM +0200, Borislav Petkov wrote:
> On Wed, Oct 11, 2017 at 04:11:37PM -0700, Andi Kleen wrote:
> > Sorry I take back what I wrote earlier. This RCU is actually still needed,
> > otherwise the reader could see partially written entries.
> 
> Why? All the readers and writers take the mutex now.

Ok fair enough.
-Andi